Multi-wavelength observations of the black widow pulsar 2FGL J2339.6-0532 with Oister and Suzaku

OISTER Team

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Multi-wavelength observations of the black widow binary system 2FGL J2339.6-0532 are reported. The Fermi gamma-ray source 2FGL J2339.6-0532 was recently categorized as a black widow in which a recycled millisecond pulsar (MSP) is evaporating the companion star with its powerful pulsar wind. Our optical observations show clear sinusoidal light curves due to the asymmetric temperature distribution of the companion star. Assuming a simple geometry, we constrained the range of the inclination angle of the binary system to 52° < i < 59°, which enables us to discuss the interaction between the pulsar wind and the companion in detail. The X-ray spectrum consists of two components: a soft, steady component that seems to originate from the surface of the MSP, and a hard, variable component from the wind-termination shock near the companion star. The measured X-ray luminosity is comparable to the bolometric luminosity of the companion, meaning that the heating efficiency is less than 0.5. In the companion orbit, 1011 cm from the pulsar, the pulsar wind is already in the particle-dominant stage with a magnetization parameter of σ < 0.1. In addition, we precisely investigated the time variations of the X-ray periodograms and detected a weakening of the orbital modulation. The observed phenomenon may be related to unstable pulsar wind activity or weak mass accretion, both of which can result in the temporal extinction of the radio pulse.

    Original languageEnglish
    Article number84
    JournalAstrophysical Journal
    Volume802
    Issue number2
    DOIs
    Publication statusPublished - 2015 Apr 1

    Fingerprint

    pulsars
    wavelength
    companion stars
    wavelengths
    luminosity
    magnetization
    x rays
    extinction
    accretion
    radio
    heating
    light curve
    geometry
    inclination
    temperature distribution
    shock
    orbits
    modulation
    orbitals
    temperature

    Keywords

    • Gamma rays: stars
    • Pulsars: general
    • Pulsars: individual (2FGL J2339.6-0532)
    • X-rays: binaries

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Multi-wavelength observations of the black widow pulsar 2FGL J2339.6-0532 with Oister and Suzaku. / OISTER Team.

    In: Astrophysical Journal, Vol. 802, No. 2, 84, 01.04.2015.

    Research output: Contribution to journalArticle

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    abstract = "Multi-wavelength observations of the black widow binary system 2FGL J2339.6-0532 are reported. The Fermi gamma-ray source 2FGL J2339.6-0532 was recently categorized as a black widow in which a recycled millisecond pulsar (MSP) is evaporating the companion star with its powerful pulsar wind. Our optical observations show clear sinusoidal light curves due to the asymmetric temperature distribution of the companion star. Assuming a simple geometry, we constrained the range of the inclination angle of the binary system to 52° < i < 59°, which enables us to discuss the interaction between the pulsar wind and the companion in detail. The X-ray spectrum consists of two components: a soft, steady component that seems to originate from the surface of the MSP, and a hard, variable component from the wind-termination shock near the companion star. The measured X-ray luminosity is comparable to the bolometric luminosity of the companion, meaning that the heating efficiency is less than 0.5. In the companion orbit, 1011 cm from the pulsar, the pulsar wind is already in the particle-dominant stage with a magnetization parameter of σ < 0.1. In addition, we precisely investigated the time variations of the X-ray periodograms and detected a weakening of the orbital modulation. The observed phenomenon may be related to unstable pulsar wind activity or weak mass accretion, both of which can result in the temporal extinction of the radio pulse.",
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    author = "{OISTER Team} and Yoichi Yatsu and Jun Kataoka and Yosuke Takahashi and Yutaro Tachibana and Nobuyuki Kawai and Shimpei Shibata and Sean Pike and Taketoshi Yoshii and Makoto Arimoto and Yoshihiko Saito and Takeshi Nakamori and Kazuhiro Sekiguchi and Daisuke Kuroda and Kenshi Yanagisawa and Hidekazu Hanayama and Makoto Watanabe and Ko Hamamoto and Hikaru Nakao and Akihito Ozaki and Kentaro Motohara and Masahiro Konishi and Ken Tateuchi and Noriyuki Matsunaga and Tomoki Morokuma and Takahiro Nagayama and Katsuhiro Murata and Hiroshi Akitaya and Michitoshi Yoshida and Ali, {Gamal B.} and Mohamed, {A. Essam} and Mizuki Isogai and Akira Arai and Hidenori Takahashi and Osamu Hashimoto and Ryo Miyanoshita and Toshihiro Omodaka and Jun Takahashi and Noritaka Tokimasa and Kentaro Matsuda and Okumura, {Shin Ichiro} and Kota Nishiyama and Seitaro Urakawa and Daisaku Nogami and Yumiko Oasa",
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    AU - Takahashi, Yosuke

    AU - Tachibana, Yutaro

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    AU - Shibata, Shimpei

    AU - Pike, Sean

    AU - Yoshii, Taketoshi

    AU - Arimoto, Makoto

    AU - Saito, Yoshihiko

    AU - Nakamori, Takeshi

    AU - Sekiguchi, Kazuhiro

    AU - Kuroda, Daisuke

    AU - Yanagisawa, Kenshi

    AU - Hanayama, Hidekazu

    AU - Watanabe, Makoto

    AU - Hamamoto, Ko

    AU - Nakao, Hikaru

    AU - Ozaki, Akihito

    AU - Motohara, Kentaro

    AU - Konishi, Masahiro

    AU - Tateuchi, Ken

    AU - Matsunaga, Noriyuki

    AU - Morokuma, Tomoki

    AU - Nagayama, Takahiro

    AU - Murata, Katsuhiro

    AU - Akitaya, Hiroshi

    AU - Yoshida, Michitoshi

    AU - Ali, Gamal B.

    AU - Mohamed, A. Essam

    AU - Isogai, Mizuki

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    AU - Takahashi, Hidenori

    AU - Hashimoto, Osamu

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    AU - Omodaka, Toshihiro

    AU - Takahashi, Jun

    AU - Tokimasa, Noritaka

    AU - Matsuda, Kentaro

    AU - Okumura, Shin Ichiro

    AU - Nishiyama, Kota

    AU - Urakawa, Seitaro

    AU - Nogami, Daisaku

    AU - Oasa, Yumiko

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    KW - Pulsars: general

    KW - Pulsars: individual (2FGL J2339.6-0532)

    KW - X-rays: binaries

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